The most important fermentation process takes place in the digester, in which the organic mass is converted into biogas, which essentially comprises methane and carbon dioxide. This process takes place through the exclusion of light and oxygen.

The long chain fatty acids are first formed into short chain fatty acids through hydrolysis, from which only the so-called methane-forming bacteria generate the biogas. This biogas is comprised of 60% methane. In this part of the biogas production, constant conditions in terms of temperature, pH value and fill capacity are needed to achieve optimal bacteria activity.

Before the biogas is used in the cogeneration unit, ReFood desulphurises it to protect the motor, gas catalyser and steam boiler.   Bacteria convert the hydrogen sulphide into elemental sulphur in a biological desulphurisation unit.

The fermentation product is then added as high-quality nutrient for plants.

After the final degassing in the combined storage, an organic fertiliser, rich in minerals and trace elements remains. Agricultural service providers take the fermented product for use as fertiliser on farm and grassland. During the legally prescribed blocking period, the fermentation product is stored until spring.